layout yolov7 support

[Shadow-Alex]

I am excited to share that I have trained a yolov7 model on the CDLA dataset, adding a small amount of self-labeled documents. I have adjusted the default training input to 1280x1280, as opposed to the standard 640. This modification has improved the model's performance on standard documents, particularly when the document's output dpi is set above 150. I am thrilled to contribute this model to your open-source community and hope it will be a valuable addition to your model zoo.

[breezedeus]

Thanks. That's great. Would you mind submitting a PR? Maybe need some text to describe what kind of pictures and scenes your model is good at.

[Ontheroad123]

I am excited to share that I have trained a yolov7 model on the CDLA dataset, adding a small amount of self-labeled documents. I have adjusted the default training input to 1280x1280, as opposed to the standard 640. This modification has improved the model's performance on standard documents, particularly when the document's output dpi is set above 150. I am thrilled to contribute this model to your open-source community and hope it will be a valuable addition to your model zoo.

Could you please contribute yolov7 model to this open-source community, your model's input size may be more suit for my tasks.